CODEWITHSUNDEEP
javaeclipsemavenwicket
Siobhan Holubicka
Siobhan Holubicka

Reputation: 157

Wicket issue field value never used

Very new to Wicket but have very basic Java. I am not understanding how "result" is not been used as I have used it in an AjaxButton function

The quickfix says to provide a getter and setter, which I did (have removed now) but still nothing happened when I click the OK button

CalcPage.java:

public class CalcPage extends WebPage{
    private int num;
    private int result; // error:The value of the field CalcPage.result is not used
    private Label r;

    public CalcPage() {
        Form<Void> f = new Form<Void>("f");
        add(f);
        f.add(new TextField<Integer>("num", new PropertyModel<Integer>(this, "num")));
        AjaxButton ok = new AjaxButton("ok") {
            @Override
            protected void onSubmit(AjaxRequestTarget target, Form<?> form) {
                result = 2 * num;
                target.add(r);
            }
            @Override
            protected void onError(AjaxRequestTarget target, Form<?> form) {

            }
        };
        f.add(ok);
        r = new Label("r", new PropertyModel<Integer>(this, "result"));
        add(r);
    }
}

CalcPage.html

<html xmlns:wicket="http://wicket.apache.org">
    <head>
        <meta charset="utf-8" />
        <title>Apache Wicket Quickstart</title>
        <link href='https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz:regular,bold' rel='stylesheet' type='text/css' />
        <link rel="stylesheet" href="style.css" type="text/css" media="screen" title="Stylesheet" />
    </head>
    <body>
        <form wicket:id="f">
            <input type="text" wicket:id="num"/>
            <input type="submit" value="OK" wicket:id="ok"/>
        </form>
        Result: <span wicket:id="r"></span>
    </body>
</html>

Hoping (according to book Enjoying web development with Wicket) to double the input but when I click on OK and nothing happens.

Also in code I am getting a compile error with @Override, once this is removed I can compile and load webpage. Are they related??

Wicket Ajax Debug window info: INFO: focus removed from

INFO: focus set on

INFO: focus removed from

INFO: focus set on wicketDebugLink

INFO: focus removed from wicketDebugLink

INFO: focus set on ok2

INFO: Received ajax response (69 characters)

INFO:

INFO: Response processed successfully.

INFO: refocus last focused component not needed/allowed

ETA I changed from private to public and that error is gone but clicking ok still doesn't work and new error has come: The method onSubmit(AjaxRequestTarget, Form) from the type new AjaxButton(){} is never used locally

Upvotes: 1

Views: 429

Answers (2)

Siobhan Holubicka
Siobhan Holubicka

Reputation: 157

Version 8 of wicket doesn't have the "form" parameter so it can be deleted:

new code 

AjaxButton ok = new AjaxButton("ok") {

        @Override
        protected void onSubmit(AjaxRequestTarget target) {
            result= 2*num;
            target.add(r);
        }

Upvotes: -1

martin-g
martin-g

Reputation: 17533

You need to call r.setOutputMarkupId(true) if you want to update a Component via Ajax.

1) if javac (or your IDE) says that @Override does not override anything then most probably you have a typo somewhere and you need to fix it, i.e. to properly override the method from super

2) never leave #onError() empty. As a minimum add some basic logging in it to notify you that there is a validation error. Maybe #onSubmit() is not called at all. The best would be to have a FeedbackPanel in the page and you should update it in #onError() - target.add(feedbackPanel)

3) Check the browser's Dev tools Console for JavaScript errors. I'd expect Wicket complaining that it cannot find an HTML element with id rXY (where XY is a number) because of the missing r.setOutputMarkupId(true)

Upvotes: 2

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